Selected work

Engineering stories, not screenshots.

What the problem was, what we decided, what we built and what changed. Client work is anonymized; our own products are named.

7 case studies shown

Distribution

Connecting Legacy Accounting to Modern Commerce

A regional distributor of truck and industrial parts

  1. QuickBooks Desktop
  2. Web Connector
  3. Integration service
  4. AI categorizer
  5. Catalog + vectors
  6. Storefront

Thousands of accounting-only items became a categorized, typo-tolerant storefront, and web orders now reach QuickBooks Desktop without re-keying.

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Financial services

Engineering Reliable Payment & Fulfillment Workflows

A regional consumer financial-services platform

  1. Cardholder
  2. 3D Secure 2
  3. Server-to-server response
  4. Verification
  5. Atomic state change
  6. Fulfillment guard

Replayed, forged and concurrent completions cannot produce a payment or a fulfillment, and gift card issuance can be frozen without stopping checkout.

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Commerce

Adding a Multi-Vendor Marketplace to an Existing Platform

A regional consumer financial-services platform

  1. Buyers & sellers
  2. Platform
  3. Stock-sync queue
  4. Sync worker
  5. Commerce engine

Sellers can be onboarded, moderated and paid inside the existing platform, and stock reconciles even when the commerce engine is briefly unavailable.

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Payments

One API for Many Billers

A regional payments middleware business

  1. Partner client
  2. Security layer
  3. Payments API
  4. Fees & commissions
  5. Biller adapters
  6. Billers & partners

Many heterogeneous billers sit behind a single partner API, and agent cash operations use single-use, expiring codes with bounded attempts.

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Treasury operations

Operational Integrity for Multi-Location Cash Ledgers

A payments business operating many branch and agent locations

  1. Branch system
  2. Edge connector
  3. Event stream
  4. Central ledger
  5. Verification queue
  6. Live dashboards & reports

Cash movements across locations land in one central ledger, with separation of duties enforced in software and every action audited.

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Nerdla productAvailable on the App Store

Building and Launching Invoiceur

Nerdla product

  1. Description
  2. On-device model
  3. Deterministic layer
  4. Review screen
  5. Draft invoice
  6. Private storage

A native, offline-first invoicing app on the App Store for Mac, iPhone and iPad, with AI-assisted drafting that keeps every amount deterministic.

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Nerdla productLaunching soon

Building Permint's Access Commerce Platform

Nerdla product

  1. Customer
  2. Reservation
  3. Stripe Checkout
  4. Signed webhook
  5. Signed pass
  6. Atomic redemption

Under concurrency tests, capacity can't be oversold, duplicate webhooks fulfil exactly once and a pass redeems exactly once.

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About confidentiality

Client case studies are anonymized and describe architecture conceptually. We don’t publish client names, code, configuration or operational details without permission.

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